Sorry cannot accommodate extra end view and there is no marking visible. No clue why the flange is thicker.
below is the other side of the valve
I think the supposed to be drain is an integrated ball valve. There is a threaded plug installed at the bottom (we've never used this feature as it is considered as leakage path).
It's just an old double ported globe valve best I can tell...I assume there is a reason to throttle the flow there? Sure is a big clamp downstream on a previous corroded / eroded area so something is going on there...seems like maybe the entire section should be replaced. Anyway, if needing a globe for throttling (and not a gate for isolation), my opinion is your best bet is to replace it with a socketweld 1500# globe with appropriate nipples and socketweld flanges...that way you can adjust the takeout if needed.
The double ported was popular at one time as it balances the forces on the plugs (flow tends to close one and open the other). I don't know of anyone still making that style manual valve, though it is very common with control valves.